Page 1 of 1

wrx heads+turbo legacy block= what compression ratio?

Posted: Thu Apr 22, 2004 6:54 am
by jake15
well like the title says i need to know what it would be and how well it would work. thanks

Posted: Thu Apr 22, 2004 2:13 pm
by rsstiboy
which block? there are quite a few

Posted: Thu Apr 22, 2004 2:16 pm
by THAWA
I'm assuming he measns the ej22 block. The only one in america so far :)

Posted: Thu Apr 22, 2004 2:46 pm
by boostjunkie
Search for any posts from Ciper. He's done A LOT of research on this topic . . . be ready to be reading A LOT!

Posted: Thu Apr 22, 2004 10:16 pm
by Matt Monson

Posted: Thu Apr 22, 2004 10:42 pm
by jake15
Thanks guys

Posted: Fri Apr 23, 2004 4:18 am
by morgie
I am presently building that setup .. (well, with Legacy TT heads in fact.. but it's almost the same)

WRX heads on ej22t block gives about 7.3:1 CR wich is quite low.

I have some custom pistons being fabricated now at CP Pistons to raise that to 8:1 . You might want to use that "recipe" too

and while you are there.. forged + lightened rods ? :)

Posted: Fri Apr 23, 2004 6:03 am
by jake15
what year are the heads you have morgie? i assume you have the twin turbo intake? would the twin turbo intake and heads work well if it was converted to single turbo and say bolted onto a 2.2t block? i was talkin with my dad and he said the wiring for the wrx intake would be to much and we just happen to have a jdm twin turbo engine lying around. i am planning on having internals made but i will probably run it with the low compression for a while since i have little $$ for stuff.

Posted: Fri Apr 23, 2004 1:57 pm
by morgie
i'll do it quick since i'm short in time :

The WRX intake dont bolt on the legacy heads. The heads i have are from 97-98 since they are "bucket and shim" type. I dont have the original Intake, but i have an intake from a 96 WRX that will bolt on. I'll simply block the holes on the driver side head and use it on a single turbo setup . The heads fits well onm the ej22t block.

Posted: Fri Apr 23, 2004 7:09 pm
by Matt Monson
why spend money on new rods. The stock ones, like the crank are already forged. Just get them cleaned up and cyro treated and call it done. That's what I am doing. And you can get pistons from Axis if you don't want to wait for a custom job to get done...

Posted: Fri Apr 23, 2004 10:14 pm
by morgie
axis take their pistons at CP and take a % .. ;)

calling CP directly saves some $$ hehe


The forged rods are not only forged.. but are aslo lightweight, with better bolts ... wich allow higher RPM's :)

Posted: Sat Apr 24, 2004 12:27 am
by Matt Monson
I wondered who did Axis' pistons. As for the rods, how far do you want to rev? Guys are revving to 7500-8000 rpms on stock rods. For me, I am going to save that money. But then I am doing a wussy build and only using a vf-29...

Posted: Sat Apr 24, 2004 2:02 pm
by morgie
well, stock rods might be hard, but surely not as hard and light than custom forged ones. I want to rev around 7500rpm.

The engine is all torn appart now. I'm installing forged pistons, so why not change the rods in the same place and have a complete peace of mind of having a block capable of handling crazy hp. With stock rods you will always have the fear as "will it handle it ? am i pushing to hard?"

But, it's true that for a 300hp setup, there is no need for all that. Also depends on what use you'll do with the car. My car will be abused a lot.. a lot of racing.. so i want it to be as hard and endurant as possible.

Posted: Sun Apr 25, 2004 3:28 am
by jake15
i'm in the same boat as morgie :twisted:

Posted: Fri Oct 26, 2007 4:45 am
by Steeper
reviving a million year old thread


Has anyone tried just using the 2.2l NA head gaskets, I know they're thinner, but I dont know by how much or how much that will affect the CR....AND anyone from this thread have results from their build? Dyno runs? butt dyno.

I am going to go ej22t from my 93 tleg, 02 wrx heads, and for now, just run the 2.2 computer and a Emanage on the wrx intake and injectors. Oh yeah, vf22 and FMIC in the summer, wrx TMIC in the winter. I know I can get it to work, but I am concerned about the low CR. NOTE, this is a budget build for now and when I feel like dropping a couple K I will go standalone OR get a stock wrx computer and wiring harness. I am getting all the sensors and everything off the intake with the heads for cheap (blew a timing belt and bent a couple valves)

also have tubular header, 3" SS turbo back, wrx tranny, act clutch and R180 rear diff (02 jdm sti) and wrx 4pot/2pots. I have some brembos from V7 sti but I've decided to go 4pot/2pot so I can run 15 inch wheels... Eventual goal is 400 HP but I think 300 is more reasonable with the electronics I am going to run for now.

Posted: Fri Oct 26, 2007 6:13 am
by 555BCTurbo
Does the Emanage allow you to reconfigure to run the WRX cam angle sensors?

If not...that shit won't run buddy